Cleon
Legend
I think the hill giant is the one that's actually over-CRed. The purple worm's poison is just plain sick. These things can burrow relatively fast, pop up, and swallow whole. The hill giant can, uh, throw rocks.
While I see where you're coming from on the realism of the coins stuck to it, the mimicry would make it a whole new creature. The sticky coins is essentially what makes a slime worm a slime worm. If you want to introduce a bit more realism, maybe it's natural coloration is a mottled metallic, filling in the spaces between the actual coins, which are more sparsely distributed along its surface?
Natural metallic camouflage between the coins is what I'm going for, so I'll be alright with some mention of that.
EDIT: Besides, if it had enough coins to completely cover itself they'd likely encumber it. I reckon a 30' Slime Worm would have a surface area of 250-475 square feet (assuming it ranges from a narrow cone to a cylinder). It would need about 50,000-200,000 coins to cover that area in a single layer of coins. That's 1,000-4,000 pounds, which could be within its Huge Str 27's Medium encumbrance of 2082-4158 lbs. If it has two layers of coins it would probably be in Heavy encumbrance. Although I suppose it could carefully arrange the coins so they are only on the parts of its hide that show when its "coiled into a horde".
Incidentally, just think how icky it must be to collect a Slime Worms treasure, peeling thousands of coins out of its slimy, bloody corpse.

Sounds like a job for an unseen servant to me.
EDITED EDIT: Actually, that gives me an idea. Maybe its 20 ft. speed includes Medium encumbrance from 2500-3500 pounds of junk stuck to its hide, and a Slime Worm without a worthwhile horde (i.e. one without its armour bonus) has a land speed of 30 feet?
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